The twisted fragment of an approximately 8-inch shard of stained glass from the historic 16th Street Baptist Church window reminded Ann Jimerson's mother of the "twisted minds” of those who attacked the Birmingham, Ala., church 50 years ago. (Courtesy of Ann Jimerson)

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A white Birmingham, Ala., family kept a shard of glass from the shattered windows of an African-American church that was firebombed in 1963. On Sept. 9, they donated it to the National Museum of African-American History and Culture in Washington, D.C.